diff --git a/src/V2/ApiHandler.php b/src/V2/ApiHandler.php
index 19dec49..4296662 100644
--- a/src/V2/ApiHandler.php
+++ b/src/V2/ApiHandler.php
@@ -69,8 +69,12 @@ public function onRequest( RequestInterface $request ) {
      *
      * @param ResponseInterface $response
      * @param RequestInterface  $request
+     *
+     * @return ResponseInterface
      */
-    public function onResponse( ResponseInterface $response, RequestInterface $request ) { }
+    public function onResponse( ResponseInterface $response, RequestInterface $request ) {
+        return $response;
+    }
 
     /**
      * Handle errors by the api.
diff --git a/src/V2/Endpoint.php b/src/V2/Endpoint.php
index d84d21b..0860ecb 100644
--- a/src/V2/Endpoint.php
+++ b/src/V2/Endpoint.php
@@ -3,6 +3,7 @@
 namespace GW2Treasures\GW2Api\V2;
 
 use GuzzleHttp\Client;
+use GuzzleHttp\Exception\GuzzleException;
 use GuzzleHttp\Exception\RequestException;
 use GuzzleHttp\Pool;
 use GuzzleHttp\Psr7\Request;
@@ -101,7 +102,7 @@ protected function request( array $query = [], $url = null, $method = 'GET', $op
         }
 
         foreach( $this->handlers as $handler ) {
-            $handler->onResponse( $response, $request );
+            $response = $handler->onResponse( $response, $request );
         }
 
         return new ApiResponse( $response );
@@ -154,7 +155,7 @@ protected function requestMany( array $queries = [], $url = null, $method = 'GET
             }
 
             foreach( $this->handlers as $handler ) {
-                $handler->onResponse( $response, $request );
+                $response = $handler->onResponse( $response, $request );
             }
 
             $responses[] = new ApiResponse( $response );
diff --git a/src/V2/Localization/LocalizationHandler.php b/src/V2/Localization/LocalizationHandler.php
index 61810fa..789d1fb 100644
--- a/src/V2/Localization/LocalizationHandler.php
+++ b/src/V2/Localization/LocalizationHandler.php
@@ -39,5 +39,7 @@ public function onResponse( ResponseInterface $response, RequestInterface $reque
             $message = 'Invalid language (expected: ' . $requestLanguage . '; actual: ' . $responseLanguage . ')';
             throw new InvalidLanguageException( $message, $requestLanguage, $responseLanguage, $response );
         }
+
+        return $response;
     }
 }
diff --git a/tests/ApiHandlerTest.php b/tests/ApiHandlerTest.php
index f1c6451..15dae92 100644
--- a/tests/ApiHandlerTest.php
+++ b/tests/ApiHandlerTest.php
@@ -21,7 +21,7 @@ protected function getHandler( IEndpoint $endpoint ) {
         return $handler;
     }
 
-    protected function makeResponse( $content, $contentType = 'application/json; charset=utf-8' ) {
+    public static function makeResponse( $content, $contentType = 'application/json; charset=utf-8' ) {
         $header = !is_null( $contentType )
             ? [ 'Content-Type' => $contentType ]
             : [];
@@ -67,6 +67,16 @@ public function testRegisterHandler() {
 
         $this->api()->registerHandler( $this->getHandler( $this->getEndpoint() ) );
     }
+
+    public function testReturnCustomResponse() {
+        $endpoint = $this->getEndpoint();
+        $this->getHandler($endpoint);
+
+        $this->mockResponse('{ "handler": false }');
+        $response = $endpoint->test();
+
+        $this->assertTrue( $response->handler );
+    }
 }
 
 class TestHandler extends ApiHandler {
@@ -77,4 +87,8 @@ public function responseAsJson( ResponseInterface $response ) {
     public function queryAsArray( RequestInterface $request ) {
         return $this->getQueryAsArray($request);
     }
+
+    public function onResponse( ResponseInterface $response, RequestInterface $request ) {
+        return ApiHandlerTest::makeResponse('{ "handler": true }');
+    }
 }